http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: TopLevelLayoutManager.java 1297404 2012-03-06 10:17:54Z vhennebert $ */

package org.apache.fop.layoutmgr;

import org.apache.fop.datatypes.Numeric;


This interface is implemented by top-level layout managers such as the ones for fo:page-sequence
and fox:external-document.

/**
 * This interface is implemented by top-level layout managers such as the ones for fo:page-sequence
 * and fox:external-document.
 */
public interface TopLevelLayoutManager {

    
Activate the layout of this page sequence.
PageViewports corresponding to each page generated by this
page sequence will be created and sent to the AreaTreeModel
for rendering.

/**
     * Activate the layout of this page sequence.
     * PageViewports corresponding to each page generated by this
     * page sequence will be created and sent to the AreaTreeModel
     * for rendering.
     */
    void activateLayout();

    
Act upon the force-page-count trait,
in relation to the initial-page-number trait of the following page-sequence.

Params:
  • nextPageSeqInitialPageNumber – initial-page-number trait of next page-sequence
/**
     * Act upon the force-page-count trait,
     * in relation to the initial-page-number trait of the following page-sequence.
     * @param nextPageSeqInitialPageNumber initial-page-number trait of next page-sequence
     */
    void doForcePageCount(Numeric nextPageSeqInitialPageNumber);

    
Finished the page-sequence and notifies everyone about it.

/**
     * Finished the page-sequence and notifies everyone about it.
     */
    void finishPageSequence();

}